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Swim at your own risk.

Swim at your own risk

To catch a glimpse of the most acidic lake ever reported, you have to climb to the top of Costa Rica's Poas volcano--but you'd better hurry because Laguna Caliente may not last long.

The lake, which has pH slightly lower than zero, sits in a small pit in the crater of this active volcano and receives its acidity from volcanic gases. Last year, small geyser explosions started shooting water and sediments out of the lake. While lake depth measured 40 meters in 1987, the water level has dropped by 13 meters and the temperature has climbed from 62[deg.] to 70[deg.]C in the last year, report Gary Rowe of Pennsylvania State University in University Park and his colleagues.
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Title Annotation:Laguna Caliente, most acidic lake ever reported
Publication:Science News
Date:Nov 12, 1988
Words:125
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